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  1. Replies
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    When I close off the port, the 2251J just doesn't...

    When I close off the port, the 2251J just doesn't sound as good nor is as flat.
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    Most current version of the crossovers. The...

    Most current version of the crossovers. The 0.9/30 ohm control the high cutoff frequency of the 2251J while the 6.8 "squares" off the top of the band. The 0.065/2.37 control the interface to the...
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    Yes, I built them and they are rear ported. The...

    Yes, I built them and they are rear ported. The 2251J was actually designed to be used in a midbass horn enclosure. A 2241H is crossed over at 225Hz.

    Lately I've taken to running the system as a...
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    I just slide mine back and forth and watch the...

    I just slide mine back and forth and watch the results on the RTA looking for the smoothest curve.
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    2251J ...

    2251J

    http://www.audioheritage.org/photopost/data//500/medium/DSC_000413.JPG...
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    Foreshadow of what's to come. Only limited by...

    Foreshadow of what's to come. Only limited by your imagination.

    http://www.audioheritage.org/photopost/data//500/medium/Ultimate_Switch_Face_copy.jpg...
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    Not what mine looks like.:dont-know: I use...

    Not what mine looks like.:dont-know:

    I use mine as a tweeter. This is the crossover, thought there have been changes to the mid.
    ...
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    The Ultimate A/B Switcher

    We've started to do somewhat regular open houses listening to peoples stuff here in So Cal. To be able to compare stuff, I'm assembling the Ultimate Switcher allowing A/B comparisons, via wireless...
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    If you actually look at the crossover, you will...

    If you actually look at the crossover, you will find that the two switches are labled to be able to switch between a 16 and 32 ohm load.
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    OK, so someone walks up and tells Alexa too blast...

    OK, so someone walks up and tells Alexa too blast the stereo and blow out the speakers.
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    So, if someone walks up to the house and yells...

    So, if someone walks up to the house and yells through the door/proximate window, "Alexa, I'm home, open the door," do you grant access to burglers?

    It has already been shown that Alexa can be...
  12. No one is "building a crossover" here or even...

    No one is "building a crossover" here or even setting the slopes. That was already done by someone more knowlegable than us, most probably The Mastering Labs, and put into a "dedicated" electronic...
  13. The Behringer provided the a nice downward curve...

    The Behringer provided the a nice downward curve and I tweaked the low bass up a couple dB from there. At this point, I have a professional noise level meter ($3K) and I can tweak each side's...
  14. Thanks guys. Did some adjustments to bring up...

    Thanks guys.

    Did some adjustments to bring up the woofers a bit. Video does not convey the actual level of deep bass felt in the room.

    https://youtu.be/jsPePauUaLo
    https://youtu.be/jsPePauUaLo
  15. CSN&Y Guinevere on the Tri-amped Big Red Supers....

    CSN&Y Guinevere on the Tri-amped Big Red Supers.
    Custom One-off Electronic Crossover
    Custom One-Off Passive eq for the Horns
    Marantz 1180DC console
    Marantz 170DC amps (2)
    Yamaha S-2300 Universal...
  16. The 2251J cabinets are ported on the rear panels....

    The 2251J cabinets are ported on the rear panels.

    Current crossover configuration.
    http://www.audioheritage.org/photopost/data//500/medium/ScreenHunter_216_Nov_12_12_13.jpg

    Rob's simulation is...
  17. Crossover is at 225 Hz. I will have to run the...

    Crossover is at 225 Hz. I will have to run the RTA again to determine the dip frequency. But know that connecting the 10" in phase creates a broad dip in one area, whereas out of phase largely...
  18. Was just a "first attempt" and that is the next...

    Was just a "first attempt" and that is the next step. It is harder to do than my main system where the Behringer provides a continual source of pink noise. In this case I use the Audiophile Test...
  19. Tri-amped Altec Super Big Reds with no passive...

    Tri-amped Altec Super Big Reds with no passive networks from the get go.

    It is interesting that I have to turn the volume on the crossover nearly full up for the horns (and aux woofers), running...
  20. I used "C" weighting and found the bass a bit...

    I used "C" weighting and found the bass a bit thin. With "A" weighting the aux woofer is way down in the reported volume but it is right up there with "C" weighting. "A" or "C" makes no difference...
  21. Do you use "A" weighting?

    Do you use "A" weighting?
  22. Setting Tri-amp Volume Levels..., How Do You Do It?

    What is the typical procedure used for setting the speaker levels for a tri-amp set-up?

    Do you set all speakers to the same volume using pink noise, or do you roll off the upper drivers a bit? ...
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    I remember paying ~$140 for mine from ebay and...

    I remember paying ~$140 for mine from ebay and bought the mic separate.

    Back in the day, Zilch used one and that's where I first saw them.
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    I too was pretty happy with what I paid for my...

    I too was pretty happy with what I paid for my 4430s.

    I got the pair, (one woofer was out but it was just a lead off on the crossover), a pair of 4330s, a pair of 4425s, and a Tascam 8 channel...
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    My own creation: 2241H woofers in ~6 cu ft, 2251J...

    My own creation: 2241H woofers in ~6 cu ft, 2251J 10" (actually ~9.75"), and Heil AMT with crossovers I designed and implemented. The crossovers have been reworked countless times and will probably...
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